In case of a power outage, to protect the write cache the controller uses an embedded battery system to keep the cache memory viable. Which of the following terms describes this behavior?

Mirrored write cache involves duplicating cache contents for redundancy, not specifically for power outage protection.

A standby power supply (SPS) or UPS provides power to an entire system, whereas the question specifically describes an embedded battery for the cache within the controller.

Cache de-staging battery is not a standard term, although a battery does enable the cache to de-stage its contents to persistent storage safely after a power event.

A battery backed cache (often called battery-backed write cache or BBWC) utilizes an embedded battery to provide continuous power to volatile cache memory in a storage controller during a power failure. This ensures that any data residing in the write cache is preserved and not lost until power is restored or the data can be safely written to persistent storage.